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| PT6420 Series 3 Amp 5V Input Adjustable Integrated Switching Regulator SLTS033A (Revised 6/30/2000) * * * * * Adjustable Output Voltage 85% Efficiency Small SIP Footprint Input Voltage Range: 4.5V to 5.5V Remote Sense Capability The PT6420 series from Power T rends is a high performance +5V to +3.3V, 3Amp family of 14-Pin SIP (Single In-line Package) Integrated Switching Regulators (ISRs). Only two external capacitors are required for proper operation. Please note that this product does not include short circuit protection. Pin-Out Information Pin 1 Ordering Information PT6424 PT6425 PT6426 PT6427 PT6428 PT6429 = +1.5 Volts = +3.3 Volts = +1.8 Volts = +2.1 Volts = +1.2 Volts = +2.5 Volts PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole P Horizontal Through-Hole D Horizontal Surface Mount E Function Remote Sense Do not connect Do not connect Vin Vin Vin GND GND GND GND Vout Vout Vout Vout Adjust Standard Application Remote Sense 1 2 3 4 5 6 C2 100F R2 (VODOWN) VIN 4,5,6 PT6420 7,8,9,10 14 11,12,13 VOUT R1 C1 100F COM + (VOUP) + 7 COM 8 9 10 11 12 13 14 Pkg Style 310 PT6420 POWER TRENDS C1 = Required 100F electrolytic C2 = Required 100F electrolytic Note: Back surface of product is conducting metal. Specifications Characteristics (Ta = 25C unless noted) Output Current Current Limit Input Voltage Range Output Voltage T olerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response with C2 = 100F Efficiency Symbols Io Icl Vin Vo Regline Regload Vn ttr Vos PT6420 SERIES Conditions 4.5V Vin 5.5V Vin = +5V 0.1A Io 3.0A Vin = +5V, Io = 3.0A 0C Ta +70C 4.5V Vin 5.5V, Io = 3.0A Vin = +5V, 0.3 I o 3.0A Vin = 5V, I o = 3.0A Io step between 1.5A and 3.0A Vo over/undershoot Vin = +5V, Io = 1.5A Vo= 3.3V Vo= 1.8V Vo= 2.1V Vo= 1.2V Min 0 -- 4.5 Vo-0.05 -- -- -- -- -- -- -- -- -- 500 0 Free Air Convection (40-60 LFM) At Vin= 5V, Io=2.5A Free Air Convection (40-60 LFM) -- Per Mil-STD-883D, Method 2002.3 , 1 msec, Half Sine, mounted to a fixture Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board -- -- 0 -- -40 -- -- -- Typ -- 3.6 -- 3.3 10 10* 66 200 200 85 74 77 63 650 -- -- 25 -- 500 15 6.5 Max 3.0 5.0 5.5 Vo+0.05 25 25* 165 -- -- -- -- -- -- 800 +85 +70** -- +125 -- -- -- Units A A V V mV mV mVpp Sec mV % % % % kHz C C C/W C G's G's grams Switching Frequency Absolute Maximum Operating T emperature Range Recommended Operating T emperature Range Thermal Resistance Storage T emperature Mechanical Shock Mechanical Vibration Weight o Ta Ta 4.5V Vin 5.5V 0.3A Io 3.0A ja Ts *When used with remote sense function. **See Thermal Derating chart. Note: The PT6420 Series requires two 100F electrolytic or tantalum capacitors for proper operation in all applications. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6420 Series 3 Amp 5V Input Adjustable Integrated Switching Regulator Typical Characteristics PT6428 1.2 VDC (See Note 1) PT6427, 2.1 VDC (See Note 1) PT6425, 3.3 VDC (See Note 1) Efficiency vs Output Current 10 0 90 10 0 90 Efficiency vs Output Current 100 90 Efficiency vs Output Current Efficiency - % Efficiency - % Efficiency - % Vin Vin 80 70 60 50 40 0.0 0.5 1.0 1.5 2.0 2.5 3.0 80 70 60 50 40 0 0.5 1 1.5 2 2.5 3 4.5V 5.0V 5.5V 4.5 V 5.0 V 5.5 V 80 Vin 4.5V 5.0V 5.5V 70 60 50 40 0 0.5 1 1.5 2 2.5 3 Iout-(Amps) Iout-(Amps) Iout-(Amps) Ripple vs Output Current 100 Ripple vs Output Current 100 80 100 Ripple vs Output Current 80 Vin 80 Ripple-(mV) Ripple-(mV) Ripple-(mV) 60 V in 5 .5V 60 40 20 0 5.5V 5.0V 4.5V Vin 60 5.5V 5.0V 40 4.5V 40 5 .0V 4 .5V 20 20 0 0 0.5 1 1.5 2 2.5 3 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 Iout-(Amps) Iout-(Amps) Iout-(Amps) Thermal Derating (Ta) 3 2.5 2 1.5 1 0.5 0 4.5 4 .7 5 5 (See Note 2) 3 85C Thermal Derating (Ta) 2.5 2 1.5 1 0.5 (See Note 2) 85C Thermal Derating (Ta) 3 2.5 2 (See Note 2) 85C Iout-(Amps) Iout-(Amps) Iout-(Amps) 1.5 1 0.5 0 0 4.5 4.75 5 5.25 5.5 5 .2 5 5.5 4.5 4.75 5 5.25 5.5 Vin-(Volts) Vin-(Volts) Vin-(Volts) Power Dissipation vs Output Current 3.0 2.5 Vin Power Dissipation vs Output Current 2.5 2 Vin 2 1.8 1.6 Power Dissipation vs Output Current PD-(Watts) PD-(Watts) PD-(Watts) 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 5.5V 5.0V 4.5V 5 .5 V 1.4 1.2 1 0.8 0.6 0.4 0.2 Vin 5.5V 5.0V 4.5V 1.5 1 0.5 0 0 0.5 1 1.5 2 2.5 3 5 .0 V 4 .5 V 0 0 0.5 1 1.5 2 2.5 3 Iout-(Amps) Iout-(Amps) Iout-(Amps) Note 1: All data listed in the above graphs except for derating data has been developed from actual products tested at 25C. This data is considered typical data for the ISR. Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.) For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6420 Series Adjusting the Output Voltage of the PT6420 Series 3AMP 5V Bus Converters The output voltage of the Power Trends PT6420 Series ISRs may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. Table 1 accordingly gives the allowable adjustment range for each model in the series as Va (min) and Va (max). Adjust Up: (See note 1) An increase in the output voltage is obtained by adding a resistor R1, between pin 14 (Vo adjust) and pins 11-13 (Vout). Adjust Down: (See note 1) Add a resistor (R2), between pin 14 (Vo adjust) and pins 7-10 (GND). Refer to Figure 1 and T able 2 for both the placement and value of the required resistor; either R1 or (R2) as appropriate. Notes: 1. The direction in which each resistor adjusts the output of the PT6420 series differs from many other Power Trends products. These output voltage adjustment notes are therefore specific only to the PT6420 models. 2. Use only a single 1% resistor in either the R1 or (R2) location. Place the resistor as close to the ISR as possible. 3. Never connect capacitors from Vo adjust to either GND, Vout, or the Remote Sense pin. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 4. The PT6420 incorporates a Remote Sense (See Figure 1). If this feature is being used, connecting the resistor R1 between pin 14 (Vo adjust) and pin 1 (Remote Sense) can benefit load regulation. 5. An increase in the output voltage may place additional limits on the input voltage range of the part. The revised minimum input voltage will be (Vout + 1.2) or 4.5V, whichever is higher. Do not exceed 5.5Vdc. Figure 1 1 Vsense 4,5,6 11,12,13 Vin Vin PT6420 GND 7,8,9,10 Vo(adj) 14 Vo Vo C1 100F + R1 Adjust Up C2 100F + L O A D (R2) Adj Down COM COM The values of R1 [adjust up], and (R2) [adjust down], can also be calculated using the following formulae. 12.45 Vo (Va - Vo) R1 = - 49.9 k (R2) = 12.45 (2Va - Vo) Vo - Va - 49.9 k Where: Vo Va = Original output voltage = Adjusted output voltage Table 1 PT6420 ADJUSTMENT RANGE Series Pt # Vo (nom) Va (min) Va (max) PT6428 1.2 1.1 1.4 PT6424 1.5 1.3 1.8 PT6426 1.8 1.5 2.2 PT6427 2.1 1.8 2.6 PT6429 2.5 2.1 3.1 PT6425 3.3 2.8 3.8 For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes continued PT6420 Series Table 2 PT6420 ADJUSTMENT RESISTOR VALUES Series Pt # Vo (nom) Va (req'd) 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 R1 = Black R2 = (Blue) 361.0k 156.0k 87.0k 52.8k 32.3k 324.0k 137.0k 74.6k 43.5k 24.8k 12.4k 398.0k 174.0k 99.5k 62.2k 39.7k 24.8k 14.1k 6.1k 473.0k 212.0k 124.0k 80.8k 54.7k 37.3k 24.8k 15.5k 8.2k 2.4k 573.0k 261.0k 158.0k 106.0k 74.6k 53.9k 39.0k 27.9k 19.3k 12.4k 2.0k (7.4)k (16.5)k (27.9)k (42.6)k (62.2)k (131.0)k (336.0)k 249.0k 99.5k 49.7k 24.8k (18.6)k (49.7)k (112.0)k (299.0)k (0.0)k (14.8)k (37.3)k (74.6)k (149.0)k (373.0)k (12.4)k (29.8)k (55.9)k (99.5)k (187.0)k (448.0)k (3.0)k (14.1)k (29.0)k (49.7)k (80.8)k (133.0)k (236.0)k (548.0)k PT6428 1.2 (74.6)k (224.0)k PT6424 1.5 PT6426 1.8 PT6427 2.1 PT6429 2.5 PT6425 3.3 For technical support and more information, see inside back cover or visit www.ti.com/powertrends I MPORTANT NOTI CE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, eitherexpress orimplied, is granted underany patent right, copyright, mask work right, orother intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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